Sidecar is an AI plugin designed for the Aide editor, operating locally in conjunction with the editor. It is responsible for creating prompts, communicating with large language models (LLMs), and managing all interactions between them. Key advantages of Sidecar include improved programming efficiency, smart code completion, and integrated AI-assisted development. Developed in Rust, it ensures both performance and safety. Sidecar is suited for developers who require efficient programming and code management on local machines.